docs: def _format_local_file(self):
          """When args.local_file empty on Windows, tries to map args.entity to a
          unc path.
  
          Updates args.local_file in-place without returning anything.
          """
  
          if self.type != 'file':
              return
  
          if not self.entity:
              return
  
          if not is_win:
              return
  
          if self._file_exists():
              return
  
          self.args.local_file = self._to_unc_path(self.entity)